Similarities and differences of shallow water deformation of tidal wave in two adjacent bays: Daya Bay and Dapeng Bay

doi:10.3969/j.issn.1001-909X.2020.03.004

Abstract

Abstract: The phenomenon of “double peak” of tidal water level in Daya Bay and Dapeng Bay was reproduced by means of the measured data, and it is determined that the abnormal growth of shallow water tide is the main cause of the phenomenon, among which the one-quarter-day tide and the one-sixth-day tide played a crucial role. The high-resolution hydrodynamic model of Daya Bay and Dapeng Bay was constructed by using the SCHISM model. The simulation shows that in the open sea outside Daya Bay and Dapeng Bay, tidal type is irregular diurnal tide in the eastern sea, tidal type is irregular semidiurnal tide in the western sea and two bays. The pattern of current is irregular semidiurnal currents in study area. The difference of hydrology between the two adjacent bays is directly caused by the deformation process of one-quarter-day and one-sixth-day tide in Daya Bay and Dapeng Bay. Through the numerical experiments of building different bottom friction intensity, eliminating bottom topography and changing water depth, it is shown that whether the direction of split tide propagation is consistent with the direction of shallower water depth is the fundamental reason that leads to the different tidal wave deformation in two bays.

Key words: Daya Bay, Dapeng Bay, shallow water tide, SCHISM

CLC Number:

P731

LI Song, GUAN Weibing, CAO Zhenyi, HE Tianqi, YANG Yun. Similarities and differences of shallow water deformation of tidal wave in two adjacent bays: Daya Bay and Dapeng Bay[J]. Journal of Marine Sciences, 2020, 38(3): 31-47.

References

[1] 杨国标.大亚湾海区潮流运动特征[J].人民珠江,2001(1):33-35.
YANG Guobiao. Characteristics of tidal current in Dayawan Sea area[J]. Yangtze River, 2001(1): 33-35.
[2] 吴仁豪,蔡树群,王盛安,等.大亚湾海域潮流和余流的三维数值模拟[J].热带海洋学报,2007,26(3):18-23.
WU Renhao, CAI Shuqun, WANG Sheng'an, et al. Three dimensional numerical simulation of tidal current and residual current at Daya Bay[J]. Journal of Tropical Oceanography, 2007, 26(3): 18-23.
[3] 王聪,林军,陈丕茂,等.年平均风场作用下大亚湾水交换的数值模拟[J].上海海洋大学学报,2009,18(3):351-358.
WANG Cong, LIN Jun, CHEN Pimao, et al. Numerical simulation of annual average wind's impact on water exchange in Daya Bay[J]. Journal of Shanghai Ocean University, 2009, 18(3): 351-358.
[4] 武文,严聿晗,宋德海.大亚湾的潮汐动力学研究——I.潮波系统的观测分析与数值模拟[J].热带海洋学报,2017,36(3):37-48.
WU Wen, YAN Yuhan, SONG Dehai. Study on the tidal dynamics in Daya Bay, China — Part I. Observation and numerical simulation of tidal dynamic system[J]. Journal of Tropical Oceanography, 2017, 36(3): 37-48.
[5] 严聿晗,武文,宋德海,等.大亚湾的潮汐动力学研究——Ⅱ.潮位和潮流双峰现象的产生机制[J].热带海洋学报,2017,36(3):46-54.
YAN Yuhan, WU Wen, SONG Dehai. Study on the tidal dynamics in Daya Bay, China — Part Ⅱ. The generation of double high waters and double-peak flood-current flows[J]. Journal of Tropical Oceanography, 2017, 36(3): 46-54.
[6] 刁希梁,丁扬,鲍献文.大亚湾海域潮位“双峰”现象生成机制研究[J].中国海洋大学学报(自然科学版),2017,47(9):1-10.
DIAO Xiliang, DING Yang, BAO Xianwen. The generation mechanism of the double peak tidal elevation in Daya Bay[J]. Periodical of Ocean University of China, 2017, 47(9): 1-10.
[7] PAWLOWICZ R, BEARDSLEY B, LENTZ S. Classical tidal harmonic analysis including error estimates in MATLAB using T_TIDE[J]. Computers & Geosciences, 2002, 28(8): 929-937.
[8] ZHANGY J, STANEV E V, GRASHORN S. Unstructured-grid model for the North Sea and Baltic Sea: Validation against observations[J]. Ocean Modelling, 2016, 97: 91-108.
[9] ZHANG Y J, YE F, STANEV E V, et al. Seamless cross-scale modeling with SCHISM[J]. Ocean Modelling, 2016, 102: 64-81.
[10] ZHANG Yinglong, BAPTISTA A M. SELFE: A semi-implicit Eulerian-Lagrangian finite-element model for cross-scale ocean circulation[J]. Ocean Modelling, 2008, 21: 71-96.
[11] Blumberg AF, Mellor GL,A description of a three-dimensional coastal ocean circulation model. In three-dimensional coastal ocean Models, coastal and estuarine series (Heaps, N.S. ed.). [J]Am Geophys Union, 1987, 4: 1-16.
[12] FOREMAN M G G, HENRY R F, WALTERS R A, et al. A finite element model for tides and resonance along the north coast of British Columbia[J]. Journal of Geophysical Research, 1993, 98(C2): 2509-2531.